WO2018030752A1 - Procédé de signalisation de retour de phase, et dispositif associé - Google Patents

Procédé de signalisation de retour de phase, et dispositif associé Download PDF

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Publication number
WO2018030752A1
WO2018030752A1 PCT/KR2017/008553 KR2017008553W WO2018030752A1 WO 2018030752 A1 WO2018030752 A1 WO 2018030752A1 KR 2017008553 W KR2017008553 W KR 2017008553W WO 2018030752 A1 WO2018030752 A1 WO 2018030752A1
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WIPO (PCT)
Prior art keywords
information
phase
terminal
phase feedback
base station
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Application number
PCT/KR2017/008553
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English (en)
Korean (ko)
Inventor
이길봄
강지원
Original Assignee
엘지전자 주식회사
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Priority to US16/324,673 priority Critical patent/US10892801B2/en
Publication of WO2018030752A1 publication Critical patent/WO2018030752A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to wireless communications, and more particularly, to a method for signaling for phase feedback and an apparatus therefor.
  • Next-generation 5G systems can be categorized into Enhanced Mobile BroadBand (eMBB) / Ultra-reliable Machine-Type Communications (uMTC) / Massive Machine-Type Communications (mMTC).
  • eMBB is a next generation mobile communication scenario with characteristics such as High Spectrum Efficiency, High User Experienced Data Rate, High Peak Data Rate
  • uMTC is a next generation mobile communication scenario with characteristics such as Ultra Reliable, Ultra Low Latency, Ultra High Availability, etc.
  • mMTC are next generation mobile communication scenarios having low cost, low energy, short packet, and mass connectivity (eg IoT).
  • An object of the present invention is to provide a method for a terminal for receiving signaling for phase feedback.
  • Another object of the present invention is to provide a terminal for receiving signaling for phase feedback.
  • Another object of the present invention is to provide a method for a base station for transmitting signaling for phase feedback.
  • Another object of the present invention is to provide a base station for transmitting signaling for phase feedback.
  • a method for a terminal for receiving signaling for phase feedback includes: a control including first information indicating whether the terminal should perform phase feedback on a plurality of beams from a base station; Receiving information; And determining whether to perform the phase feedback based on the control information.
  • the method may further include receiving a downlink channel beam-cycled in units of resource elements (REs) or resource blocks (RBs) from the base station.
  • the control information may further include second information for phase information feedback of the terminal.
  • the method may further include transmitting information on the phase feedback based on the control information.
  • control information may further include second information indicating a precoder scheme applied when the terminal receives downlink.
  • the control information may further include information about the number of bits to be used for the phase feedback.
  • the method may further include determining a level of phase information to be phase fed back based on the number of bits to use for the phase feedback.
  • a terminal receiving signaling for phase feedback receives control information including first information from the base station indicating whether the terminal should perform phase feedback on a plurality of beams.
  • a receiver configured to;
  • a processor configured to determine whether to perform the phase feedback based on the control information.
  • the terminal may further include a receiver configured to receive a downlink channel beam-cycled (RE) in units of resource elements (REs) or resource blocks (RBs) from the base station.
  • the control information may further include second information for phase information feedback of the terminal.
  • the transmitter may further include a transmitter configured to transmit information on phase feedback based on the control information.
  • the control information may further include second information indicating a precoder scheme applied when the terminal receives downlink.
  • the apparatus may further include information on the number of bits to be used for the phase feedback, and the processor may be configured to determine a level of phase information to be phase-feedback based on the number of bits to be used for the phase feedback.
  • a method for a base station for transmitting signaling for phase feedback includes control information including first information indicating whether the terminal should perform phase feedback on a plurality of beams Transmitting to the terminal; And when the first information indicates not to perform the phase feedback, transmitting a downlink channel beam-cycled in units of a resource element (RE) or a resource block (RB) to the terminal. can do.
  • control information including first information indicating whether the terminal should perform phase feedback on a plurality of beams Transmitting to the terminal; And when the first information indicates not to perform the phase feedback, transmitting a downlink channel beam-cycled in units of a resource element (RE) or a resource block (RB) to the terminal.
  • a base station for transmitting signaling for phase feedback includes a transmitter; And a processor, wherein the processor controls the transmitter to transmit control information to the terminal, the control information including first information indicating whether the terminal should perform phase feedback on a plurality of beams, and the first information. If the command indicates not to perform the phase feedback, the transmitter may be controlled to transmit a downlink channel beam-cycled in units of a resource element (RE) or a resource block (RB) to the terminal.
  • RE resource element
  • RB resource block
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • FIG. 2 is a diagram illustrating a frame structure of an LTE / LTE-A system.
  • FIG 3 illustrates a resource grid of a downlink slot of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • FIG. 4 illustrates a structure of a downlink subframe of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • FIG. 5 illustrates a structure of an uplink subframe used in a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • FIG. 6 is a diagram illustrating a distributed terminal multi-antenna arrangement.
  • FIG. 7 is a diagram illustrating the mounting of multiple antenna panel array in the terminal.
  • FIG 8 illustrates a panel and an RF chain in a communication device.
  • FIG. 9 is a diagram illustrating beams between a base station and a terminal.
  • FIG. 10 is an exemplary diagram for explaining a RE level beam cycling method.
  • FIG. 11 is an exemplary diagram for explaining a method of RB level beam cycling.
  • DMRS 12 is a diagram illustrating a Demodualtion RS (DMRS) design.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
  • UE user equipment
  • MS mobile station
  • AMS advanced mobile station
  • AP Access Point
  • a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • the wireless communication system 100 may include one or more base stations and / or one or more terminals. .
  • the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 170, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
  • MIMO multiple input multiple output
  • SU-MIMO single user-MIMO
  • MU-MIMO multi-user-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
  • the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
  • pilot symbols may be sent continuously.
  • the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
  • Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission via the transmission antenna 130, the transmission antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
  • the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
  • the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
  • the received data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
  • Processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (eg, control, coordinate, manage, etc.) operations at the terminal 110 and the base station 105, respectively.
  • Respective processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
  • the memory 160, 185 is coupled to the processor 180 to store the operating system, applications, and general files.
  • the transmitter and the receiver may be configured as an RF unit.
  • the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
  • the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
  • the layers of the air interface protocol between the terminal and the base station between the wireless communication system (network) are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), And the third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • the processor 155 of the terminal and the processor 180 of the base station process the signals and data, except for the function of receiving or transmitting the signal and the storage function of the terminal 110 and the base station 105, respectively.
  • the following description does not specifically refer to the processors 155 and 180.
  • the processors 155 and 180 it may be said that a series of operations such as a function of receiving or transmitting a signal and a data processing other than a storage function are performed.
  • FIG. 2 is a diagram illustrating a frame structure of an LTE / LTE-A system.
  • one frame consists of 10 ms and ten 1 ms subframes.
  • the time for transmitting one subframe may be defined as a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe consists of two 0.5 ms slots, and one slot consists of seven (or six) Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • the 3GPP LTE system uses OFDMA in downlink, and an OFDM symbol represents one symbol period.
  • An OFDM symbol may be referred to as an SC-FDMA symbol or one symbol period.
  • a resource block (RB) is a resource allocation unit and includes a plurality of subcarriers adjacent to one slot.
  • the structure of the radio frame shown in FIG. 2 is exemplary, so that the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in one slot may be changed in various ways. .
  • One resource block is defined by 12 subcarriers spaced at 15 kHz and 7 OFDM symbols.
  • the base station transmits a Primary Synchronization Signal (PSS) for Synchronization, a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH) for system information at the Center Frequency 6RB.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH Physical Broadcast Channel
  • FIG 3 illustrates a resource grid of a downlink slot of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • the downlink slot includes a plurality of OFDM symbols in the time domain.
  • One downlink slot may include 7 (or 6) OFDM symbols and the resource block may include 12 subcarriers in the frequency domain.
  • Each element on the resource grid is referred to as a resource element (RE).
  • One RB contains 12x7 (6) REs.
  • the number of RBs included in the downlink slot NRB depends on the downlink transmission band.
  • the structure of an uplink slot is the same as that of a downlink slot, but an OFDM symbol is replaced with an SC-FDMA symbol.
  • FIG. 4 illustrates a structure of a downlink subframe of a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • up to three (or four) OFDM symbols located at the front of the first slot of a subframe correspond to a control region to which a control channel is allocated.
  • the remaining OFDM symbols correspond to data regions to which the Physical Downlink Shared CHance (PDSCH) is allocated.
  • Examples of a downlink control channel used in LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), a Physical Hybrid ARQ Indicator Channel (PHICH), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe.
  • the PHICH carries a HARQ ACK / NACK (Hybrid Automatic Repeat request acknowledgment / negative-acknowledgment) signal in response to uplink transmission.
  • DCI downlink control information
  • the DCI format is defined as format 0 for uplink, formats 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, and so on for downlink.
  • the DCI format includes a hopping flag, RB assignment, modulation coding scheme (MCS), redundancy version (RV), new data indicator (NDI), transmit power control (TPC), and cyclic shift DM RS, depending on the application.
  • MCS modulation coding scheme
  • RV redundancy version
  • NDI new data indicator
  • TPC transmit power control
  • Information including a reference signal (CQI), a channel quality information (CQI) request, a HARQ process number, a transmitted precoding matrix indicator (TPMI), and a precoding matrix indicator (PMI) confirmation are optionally included.
  • CQI reference signal
  • CQI channel quality information
  • TPMI transmitted precoding matrix indicator
  • PMI pre
  • the PDCCH includes a transmission format and resource allocation information of a downlink shared channel (DL-SCH), a transmission format and resource allocation information of an uplink shared channel (UL-SCH), a paging channel, Resource allocation information of upper-layer control messages such as paging information on PCH), system information on DL-SCH, random access response transmitted on PDSCH, Tx power control command set for individual terminals in terminal group, Tx power control command , The activation instruction information of the Voice over IP (VoIP).
  • a plurality of PDCCHs may be transmitted in the control region.
  • the terminal may monitor the plurality of PDCCHs.
  • the PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • the CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of PDCCH bits are determined according to the number of CCEs.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
  • the CRC is masked with an identifier (eg, a radio network temporary identifier (RNTI)) according to the owner or purpose of use of the PDCCH.
  • RNTI radio network temporary identifier
  • an identifier eg, cell-RNTI (C-RNTI)
  • C-RNTI cell-RNTI
  • P-RNTI paging-RNTI
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • FIG. 5 illustrates a structure of an uplink subframe used in a 3GPP LTE / LTE-A system as an example of a wireless communication system.
  • an uplink subframe includes a plurality of slots (eg, two).
  • the slot may include different numbers of SC-FDMA symbols according to the CP length.
  • the uplink subframe is divided into a data region and a control region in the frequency domain.
  • the data area includes a PUSCH (Physical Uplink Shared CHannel) and is used to transmit a data signal such as voice.
  • the control region includes a PUCCH (Physical Uplink Control CHannel) and is used to transmit uplink control information (UCI).
  • the PUCCH includes RB pairs located at both ends of the data region on the frequency axis and hops to a slot boundary.
  • PUCCH may be used to transmit the following control information.
  • SR Service Request: Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.
  • HARQ ACK / NACK This is a response signal for a downlink data packet on a PDSCH. Indicates whether the downlink data packet was successfully received.
  • One bit of ACK / NACK is transmitted in response to a single downlink codeword (CodeWord, CW), and two bits of ACK / NACK are transmitted in response to two downlink codewords.
  • CQI Channel Quality Indicator
  • MIMO Multiple input multiple output
  • RI rank indicator
  • PMI precoding matrix indicator
  • PTI precoding type indicator
  • the amount of control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for control information transmission.
  • SC-FDMA available for transmission of control information means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of the subframe in which the Sounding Reference Signal (SRS) is set, the last of the subframe SC-FDMA symbols are also excluded.
  • the reference signal is used for coherent detection of the PUCCH.
  • PUCCH supports seven formats according to the transmitted information.
  • FIG. 6 is a diagram illustrating a distributed terminal multi-antenna arrangement.
  • the use of ultra-high frequency bands including millimeter wave bands up to 100 GHz is being considered.
  • the number of antennas to which a terminal may be mounted may also consider tens to hundreds of antennas.
  • the vehicle may be one terminal, and thus, a plurality of antennas may be distributed and installed in one or several vehicle positions.
  • a plurality of antenna panel arrays may be installed in a terminal mainly in a high frequency band.
  • 7 is a diagram illustrating the mounting of multiple antenna panel array in the terminal.
  • a plurality of antenna elements are distributed at uniform intervals in the antenna panel array, but antenna directions or intervals may be nonuniform between panel arrays.
  • signals transmitted from each antenna array / panel use different oscillators
  • signals may be transmitted at slightly different frequencies due to oscillator errors. This may cause frequency synchronization error at the base station.
  • noise reduction due to size reduction, phase distortion, and ICI may occur in the base station from a specific antenna group.
  • the size / phase distortion problem of the above-described UE transmit antenna group may vary according to UE implementation.
  • the cabling issue may be solved by implementing a separate procedure for compensating the delay difference for each antenna group in the terminal, and the oscillator issue may be solved by using a single oscillator or introducing a separate frequency compensation procedure. It may be.
  • this compensation process may require a separate processor or RF circuit, thereby increasing the complexity and cost of terminal implementation.
  • the present invention proposes an adaptive uplink multi-antenna transmission scheme and related signaling procedures according to the inter-APG distortion vulnerability level (antenna port group (APG)) of signal between different antenna groups for each terminal. do.
  • APG antigenna port group
  • DVL the distortion vulnerability level
  • Proposal 1 The terminal reports the following information to the base station.
  • Case1 [non-precoded SRS]: The terminal reports port grouping information on uplink reference signal (RS) ports to the base station.
  • RS uplink reference signal
  • Case2 [beamformed SRS]: The terminal reports the number of uplink antenna arrays / panels / groups or RS port grouping information or information on the maximum number of RS ports per RS port group to the base station.
  • the base station receiving the information may indicate the port grouping information in the process of performing uplink RS transmission setup to the corresponding terminal.
  • the terminal may report the DVL information between the port groups to the base station.
  • the uplink RS will be described with a Sounding Referenece Signal or Sounding Refrence Symbol (SRS) as an example of the uplink RS.
  • SRS Sounding Referenece Signal or Sounding Refrence Symbol
  • the information on SRS port grouping indicates explicitly or implicitly how many port groups of the total M SRSs are included and how many SRS ports are included in each port group.
  • the port group information may correspond to antenna panel array configuration information or distributed antenna unit information of a terminal.
  • An example of the port group information is as follows.
  • the SRS port grouping information may be used for configuring, determining, and indicating a UL MIMO precoder (to be described in detail in Proposal 2 below).
  • the SRS port grouping information may be utilized for uplink synchronization estimation / correction. For example, since the frequency / time synchronization characteristic may be different for each SRS port group, the base station may perform uplink synchronization correction based only on a specific SRS port group.
  • the SRS port grouping information may be utilized for uplink channel estimation.
  • the base station when the base station estimates the channel based on all SRS ports, the base station will measure the jitter increased by the oscillator characteristic different from the delay spread increased by the cable delay at the antenna port group level. Therefore, measurements may be required at the SRS port group level depending on the purpose and channel parameters to be estimated. In addition, large scale fading (e.g. shadowing) may be different for each SRS port group, and thus quality values such as RSRP, RSRQ, and CQI may be used to measure SRS port groups. Finally, the base station may measure the phase / magnitude distortion value for each uplink antenna array / panel / group or SRS port group to inform the user of this information to transmit the information. For example, the base station may measure the frequency linear phase shift value generated by the cable delay difference for each SRS port group and transmit the phase shift value for each SRS port group to the terminal.
  • the base station may measure the frequency linear phase shift value generated by the cable delay difference for each SRS port group and transmit the phase shift value for each SRS port group to the terminal.
  • Proposal 1-1 As a specific proposal of Proposition 1, the base station receiving the RS port grouping information includes one of uplink MIMO precoding configuration information, uplink sync estimation / correction, uplink channel estimation, and distortion compensation for each RS port group. In the above, the RS port grouping information can be utilized.
  • the base station may signal the size / phase compensation value for each RS port group to the terminal.
  • DVL information between SRS port groups proposed in the proposal 1 three levels of HIGH, MIDIUM, and LOW may be considered.
  • two stages of ON and OFF types may be considered depending on whether significant phase / magnitude distortion occurs. Since the DVL and / or SRS port grouping information proposed in the present invention is not information dynamically changing as information on UE characteristics, it may be more preferable to transmit the information in an upper layer signaling (e.g. RRC signaling) message.
  • an upper layer signaling e.g. RRC signaling
  • Proposal 2 Base stations To the terminal Uplink MIMO precoder Configure the configuration information, and at this time, uplink MIMO precoder
  • the configuration information may include the following information (1), (2) and (3).
  • Partial precoder configuration information PMI information to be used for each SRS port group [non-precoded SRS case] or SRS port index (es) information [beamformed SRS case]
  • the presence / size of size / phase matching information between partial precoders may be differentiated according to the DVL of the UE or the indication of the BS. In this case, whether or not the cycling of the concatenating precoder and the range (for example, precoder set information) may be included in the size / phase matching information between partial precoders.
  • candidate concatenating precoding schemes may include transmit diversity or open loop precoding (for example, large delay CDD precoder in LTE systems).
  • the uplink MIMO precoder configuration information may include (3) simultaneous transmission layer number (or rank number) information, and the simultaneous transmission layer number (or rank number) is indicated with a common value for all SRS ports.
  • the base station basically indicates precoder information to be used for each SRS port group, but the phase compensation information between the SRS port groups is differentiated according to the DVL.
  • MIMO precoder information to be used for each SRS port group is used by the UE to use uplink PMI (precoding matrix indicator and rank indicator)
  • uplink PMI precoding matrix indicator and rank indicator
  • the PMI or the port selection information may be indicated in units of SRS port groups so that a partial precoder can be configured in units of a terminal antenna group having different radio channels and hardware characteristics.
  • the RI information common RI
  • only one value may be signaled from the base station to the terminal.
  • the RI information since the RI information may be implicitly signaled by the number of ports for each SRS port group indicating, the RI information may be omitted.
  • Equation 2 the final precoding matrix
  • the size / phase compensation between partial precoders is the same reason that concatenating PMI (CPMI) information is required for cooperative transmission between a plurality of base stations in downlink.
  • the size compensation information may be indicated by the base station to the terminal when the pathloss or shadowing characteristics experienced by the antenna groups are different, and may be omitted when the characteristics are similar.
  • Table 1 below shows an embodiment of differentiating downlink control information according to DVL (DCI case 1 corresponds to non-precoded SRS transmission and case 2 corresponds to beamformed SRS transmission).
  • the application of the scheme of Table 1 focuses on the fact that a terminal having a high DVL may suffer from a lack or absence of phase compensation information, but this may be unnecessary due to the possibility of phase distortion due to hardware characteristics.
  • Such a terminal may generate a plurality of concatenating precoders and take the form of transmission using alternating time / frequency resource units. This specific scheme is described in Proposal 3 below.
  • the base station can signal information necessary for the terminal to apply the concatenating precoder cycling technique.
  • the information required for applying the concatenating precoder cycling technique may include information indicating whether to cycle, a phase / size range of cycling, and concatenating precoder set information.
  • Proposal 3 [Semi-open loop UL MIMO precoding ] DVL
  • a UE that is instructed to apply the following technique by a UE or a base station having a Distortion Value Level below a specific level may apply during uplink transmission.
  • MIMO precoder Below and Configure together.
  • Partial Precoder The UE may determine the partial precoder through downlink control information indicated by the base station.
  • Method 1 The UE may arbitrarily select a concatenating precoder as a predetermined time / frequency resource unit, or may use a concatenating precoder indicated in advance through higher layer signaling or as a standard.
  • Method 2 The terminal generates a plurality of concatenating precoder sets based on the concatenating precoder information generated through information indicated by the base station (for example, downlink control information), and alternates the predetermined time / frequency resource units. Can be used.
  • Table 2 below shows an example in which the proposal 3 is applied to a three-stage DVL.
  • the terminal transmits demodulation RS port (s) by using a partial precoder designated by the base station for each antenna group, but is used for a channel such as an uplink data channel (eg, PUSCH) and uplink control channel (eg, PUCCH).
  • An open loop precoding scheme such as a transmit diversity scheme, may be applied to the corresponding ports.
  • This method is the same as applying open loop precoding using a plurality of cell-specific RS ports compared to the method of 3GPP LTE system, except that each RS port applies beamforming designated by a base station for each antenna group. .
  • each RS port applies beamforming designated by a base station for each antenna group.
  • the scheme may be demodulated by assuming that the base station and the terminal must be promised to apply the scheme.
  • FIG 8 illustrates a panel and an RF chain in a communication device.
  • each panel having two RF chains.
  • a total of four RF chains can be defined. It is shown that analog beams having different directions are defined in each of the four RF chains.
  • each RF chain has a separate RF (for example, an oscillator)
  • their phase may have the following characteristics.
  • FIG. 9 is a diagram illustrating beams between a base station and a terminal.
  • the terminal feeds back information on the phase or phase difference of the two beams to the base station so that coherent combining can be performed.
  • the base station can adjust the phase of each beam to coherent combining at the terminal entrance based on the information about the phase of the feedback beam (including information on the phase of the two beams or the phase difference between the two beams).
  • Proposal 4 Indication of feedback of phase information
  • the base station informs the terminal of feedback about the phase (including phase information of a plurality of beams or information on the phase difference of the plurality of beams) to the terminal through downlink control information (DCI) and / or RRC signaling.
  • DCI downlink control information
  • RRC Radio Resource Control
  • the terminal determines whether to give feedback on the phase information based on the DCI and / or RRC signaling received from the base station. Meanwhile, the proposal 4 may be extended as follows.
  • the DVL information may be transmitted in a DCI and / or RRC signal.
  • Proposal 5 Indication of the number of bits (feedback bits or bits of feedback information) to use when feeding back information about a phase
  • the base station informs the terminal of the number of bits to use for phase information feedback through DCI and / or RRC signaling.
  • the terminal may determine the phase information level to be fed back based on the received information on the number of bits.
  • the proposal 5 may proceed after the proposal 4 is defined.
  • the base station may inform the terminal whether the feedback of the phase information and the number of bits of the feedback information at the same time.
  • the field indicating the number of bits of the feedback information may not be defined by the base station.
  • the number of feedback bits may be informed regardless of the proposal 4 (the proposal 5 operates regardless of the proposal 4).
  • the phase information level may be as follows.
  • phase information can be represented. That is, in the case of 1 bit, only 1 or -1 may be represented, but in the case of 2 bit, it may be represented by 1, j, -1, or -j.
  • the feedback bits shown in the uplink DCI represent the number of bits of each phase.
  • the uplink DCI may represent the total number of feedback bits instead of the bits of each phase.
  • the DCI format is as follows.
  • 1bit or 0bits can be 0bits for feedback. If the feedback grant is rejected, the number of phase bits can be zero.
  • the base station transmits data using the following method.
  • 1 RB is composed of 12 subcarriers (horizontal axis) x 14 symbols (vertical axis).
  • FIG. 10 is an exemplary diagram for explaining a RE level beam cycling method.
  • Method 1 In FIG. 10, it is assumed that a base station has one panel and that panel has two RF chains. And, PMI of each RF chain is assumed to be P1 and P2, respectively. In this case, when the base station transmits two different beams generated from two RF chains, it applies [1 1] and [1 -1] as RE levels. That is, the first axis defines P1 + P2 and the second RE defines P1-P2.
  • FIG. 11 is an exemplary diagram for explaining a method of RB level beam cycling.
  • FIG. 11 makes the same assumptions as Method 1 of FIG. Instead, the base station applies [1 1] and [1 -1] to RB (Resource Block) level when transmitting two different beams generated from two RF chains. That is, P1 + P2 is defined for the first RB and P1-P2 for the second RB.
  • the base station may inform the terminal of a method of transmitting a reference signal (RS) for CFO estimation with RRC signaling and / or DCI.
  • RS reference signal
  • DMRS 12 is a diagram illustrating a Demodualtion RS (DMRS) design.
  • RS for CFO estimation refers to CFO port 2 or CFO port 2/3 in FIG.
  • the TRP may transmit the RS corresponding to the CFO port 2 to the UE and transmit the RS for the CFO port 2 to the RRC signaling and / or the DCI.
  • the DMRS is CDM it is difficult to use the DMRS when estimating the CFO. Therefore, define a separate CFO port 2.
  • TRP 1 may transmit an RS corresponding to CFO port 0 to the UE and TRP 2 may transmit an RS corresponding to CFO port 1 (TRP 1 and TRP 2 are different TRPs).
  • the TRP may inform the UE of how the DMRS port 0/1 and the CFO port 2/3 are mapped to each other by DCI and / or RRC signaling, respectively.
  • the UE estimates CFOs of different ports using CFO port 0 and CFO port 1, respectively. And, based on the estimation, the terminal estimates a channel for data detection using DMRS port A, DMRS port B.
  • the DMRS port 0/1 means a port for channel estimation of two different analog beams.
  • the UE can estimate the DMRS port 0/1 by the following equation (3).
  • CFO 0 is used to estimate exp (j ⁇ )
  • CFO 1 is used to estimate exp (j ⁇ ).
  • the receiver redefines DMR port 0 and DMRS port 1 as shown in Equation 4 below.
  • Equation 4 cannot be applied.
  • each panel or RF chain in a panel has its own PMI and phase.
  • the virtual panel or the virtual RF chain may be defined by virtualizing some of the panels or the RF chains.
  • the PMI and phase may also be redefined to fit the virtual panel or the virtual RF chain.
  • the phase information of the base station may be set to UE common.
  • the base station may select a specific terminal and receive feedback on the phase information using the proposal 4 and the fifth.
  • other terminals may be supported based on the information on the phase.
  • the panel may be replaced with an antenna array or an antenna group.
  • a base station having a plurality of antenna arrays / panels / groups defines signaling and UE behavior for receiving feedback of information on the phase of each panel from a terminal during downlink transmission.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • a method for signaling for phase feedback and an apparatus therefor may be industrially applied to various wireless communication systems such as 3GPP LTE / LTE-A and 5G systems.

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  • Mathematical Physics (AREA)
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Abstract

L'invention concerne un procédé pour une signalisation de réception de terminal pour un retour de phase qui peut comprendre les étapes consistant à : recevoir, en provenance d'une station de base, des informations de commande comprenant des premières informations indiquant si le terminal doit effectuer le retour de phase pour une pluralité de faisceaux; et déterminer s'il faut effectuer le retour de phase sur la base des informations de commande.
PCT/KR2017/008553 2016-08-12 2017-08-08 Procédé de signalisation de retour de phase, et dispositif associé WO2018030752A1 (fr)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108023623B (zh) * 2016-11-04 2022-05-27 维沃移动通信有限公司 一种终端信息上报、获取方法、终端及基站
CN108288984B (zh) * 2017-01-09 2022-05-10 华为技术有限公司 一种参数指示及确定方法和接收端设备及发射端设备
CN113965231A (zh) * 2017-03-24 2022-01-21 华为技术有限公司 信息的传输方法和设备
WO2020073289A1 (fr) * 2018-10-11 2020-04-16 Lenovo (Beijing) Limited Procédé et appareil pour transmissions pusch basées sur un livre de codes à panneaux multiples et/ou à faisceaux multiples
EP4027531A4 (fr) * 2019-09-30 2022-09-14 Huawei Technologies Co., Ltd. Procédé de mesure de canal et dispositif de communication

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080047111A (ko) * 2006-11-24 2008-05-28 엘지전자 주식회사 통신 시스템에서의 적응적 피드백 수행 방법 및 이를구현하는 송수신기
KR20100083534A (ko) * 2009-01-14 2010-07-22 고려대학교 산학협력단 다중 입출력 시스템의 선처리 장치 및 방법
US20140126398A1 (en) * 2012-11-05 2014-05-08 Broadcom Corporation Channel estimation for phase-only feedback and methods for use therewith
US20140355719A1 (en) * 2011-02-16 2014-12-04 Google Inc. Method and device for phase adjustment based on closed-loop diversity feedback
US20150003365A1 (en) * 2012-02-09 2015-01-01 Lg Electronics Inc. Method for allocating reference signal antenna port for transmission diversity technique in wireless communication system, and apparatus for same

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4845640B2 (ja) * 2006-08-23 2011-12-28 富士通株式会社 無線通信システムおよび無線通信方法
WO2008139630A1 (fr) * 2007-05-16 2008-11-20 Fujitsu Limited Appareil de communication radio et procédé de communication radio
US8891652B2 (en) * 2010-06-24 2014-11-18 Qualcomm Incorporated Structured MIMO codebook
CN102932112B (zh) * 2011-08-11 2015-11-25 华为技术有限公司 一种多天线传输的方法及装置
US8953478B2 (en) * 2012-01-27 2015-02-10 Intel Corporation Evolved node B and method for coherent coordinated multipoint transmission with per CSI-RS feedback
CN102685874B (zh) * 2012-04-12 2018-11-23 南京中兴新软件有限责任公司 一种多个接入点间偏差校准方法、系统和装置
KR102054195B1 (ko) * 2013-07-02 2019-12-11 삼성전자 주식회사 이동 통신 시스템에서 데이터 경로 최적화 방법 및 장치
US9967124B2 (en) * 2014-03-26 2018-05-08 Nokia Solutions And Networks Oy Use of basis functions for transmission of broadcast control information in a wireless network
US10224993B2 (en) * 2014-05-02 2019-03-05 Lg Electronics Inc. Beamforming method in multi-antenna wireless communication system and apparatus for same
JP6104476B2 (ja) * 2015-04-13 2017-03-29 三菱電機株式会社 フェーズドアレイアンテナ装置
CN108476083B (zh) * 2016-02-05 2020-11-20 株式会社Ntt都科摩 用户装置及基站
US10097254B2 (en) * 2016-04-18 2018-10-09 Qualcomm Incorporated Channel state information estimation and channel information reporting
WO2018016700A1 (fr) * 2016-07-22 2018-01-25 엘지전자 주식회사 Procédé d'émission multi-antenne en liaison montante dans un système de communication sans fil et appareil associé
US10298300B2 (en) * 2016-07-27 2019-05-21 Samsung Electronics Co., Ltd. Linear combination codebook for CSI reporting in advanced wireless communication systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080047111A (ko) * 2006-11-24 2008-05-28 엘지전자 주식회사 통신 시스템에서의 적응적 피드백 수행 방법 및 이를구현하는 송수신기
KR20100083534A (ko) * 2009-01-14 2010-07-22 고려대학교 산학협력단 다중 입출력 시스템의 선처리 장치 및 방법
US20140355719A1 (en) * 2011-02-16 2014-12-04 Google Inc. Method and device for phase adjustment based on closed-loop diversity feedback
US20150003365A1 (en) * 2012-02-09 2015-01-01 Lg Electronics Inc. Method for allocating reference signal antenna port for transmission diversity technique in wireless communication system, and apparatus for same
US20140126398A1 (en) * 2012-11-05 2014-05-08 Broadcom Corporation Channel estimation for phase-only feedback and methods for use therewith

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